A complicated sexual act. One Guy has his friend hide in his bedroom. Then the guy comes back with his girlfriend, and they start to shag. When they start doggy style, the friend comes out of his hiding place, and swaps places with his friend, without the girl noticing. Then the first guy goes outside and waves at his Girlfriend through the window.

Mate I need to break up with my girlfriend, you fancy assisting me with a Loughborough wave?